Hot Forming Characteristics of Magnesium Alloy AZ31 and Three-Dimensional FE Modeling and Simulation of the Hot Splitting Spinning Process

Friction stir processes (FSP) are important for enhancing mechanical properties of metal sheets, such as the tensile strength, the elongation, etc. The stress distribution of the tool pin is affected by the thermo-mechanical characteristics of the workpiece in FSP. Recently, magnesium alloy AZ31 is widely used in machine industries due to the light-weight material property. In this paper, a thermo-mechanical model for FSP using three dimensional FEM analyses is proposed for exploring temperature distributions, strain distributions and stress distributions of the workpiece. The heat generated from the plastic deformation and the friction between the head tool and workpiece is considered as the heat source in the simulation of the FSP process. A commercial finite element code – DEFORM 3D is used to carry out the simulation of the plastic deformation of AZ31 sheets during the FSP. The analytical results of temperature, strain and stress distributions of the workpiece and head tool can provide useful knowledge for tool pin design in FSP

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Complex Flow Stress Model for a Magnesium Alloy AZ31 at Hot Forming

High Temperature Materials and Processes ◽

10.1515/htmp.2011.008 ◽

2011 ◽

Vol 30 (1-2) ◽

Cited By ~ 2

Author(s):

Miroslav Legerski ◽

Jiří Plura ◽

Ivo Schindler ◽

Stanislav Rusz ◽

Petr Kawulok ◽

...

Keyword(s):

Flow Stress ◽

Magnesium Alloy ◽

Hot Forming ◽

Stress Model ◽

Complex Flow ◽

Alloy Az31 ◽

Magnesium Alloy Az31 ◽

Flow Stress Model

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Thermo-Mechanical Analysis of a Lever Preform Forming from Magnesium Alloy AZ31 / Termomechaniczna Analiza Kształtowania Przedkuwki Dźwigni Ze Stopu Magnezu AZ31

Archives of Metallurgy and Materials ◽

10.2478/v10172-012-0135-z ◽

2012 ◽

Vol 57 (4) ◽

pp. 1211-1218 ◽

Cited By ~ 12

Author(s):

J. Tomczak ◽

Z. Pater ◽

T. Bulzak

Keyword(s):

Magnesium Alloy ◽

Numerical Simulations ◽

Metal Forming ◽

Three Dimensional ◽

Mechanical Analysis ◽

Forming Process ◽

Longitudinal Rolling ◽

Alloy Az31 ◽

Magnesium Alloy Az31 ◽

Large Material

This paper presents the results of numerical analysis of metal forming process of a lever preform from magnesium alloy AZ31, which will be used as a semi-finished product in the forging process of a lever part. Presently, the lever forging is formed from semi-finished product in the form of a bar, which is connected with large material losses. Numerical simulations were made for two different metal forming methods: forging longitudinal rolling and cross-wedge rolling. Calculations were conducted basing on finite element method (FEM), applying commercial software DEFORM-3D. Geometrical models used in calculations were discussed. Simulations, made in conditions of three dimensional state of strain, allowed for determining distributions of strain intensity, temperature, cracking criterion, and mainly for determining the possibility of a lever preform manufacturing on the basis of rolling processes. Considering the obtained results of numerical simulations, the design of tools for semi-finished products rolling was worked out; these semi-finished products will be used for experimental verification of the lever preforms forming.

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